Bound excitons in Cu2O:: Efficient internal free exciton detector

被引：28

作者：

Jang, J. I. ^{[1
]}

Sun, Y. ^{[1
]}

Watkins, B. ^{[1
]}

Ketterson, J. B. ^{[1
]}

机构：

[1] Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA

来源：

PHYSICAL REVIEW B | 2006年 / 74卷 / 23期

关键词：

D O I：

10.1103/PhysRevB.74.235204

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report the spectroscopic observation of bound excitons in natural Cu2O samples, which are generated by impurity capture of free excitons. Due to the broken symmetry of a bound exciton, its radiative recombination rate increases, causing a greatly enhanced luminescence intensity compared with that for a free exciton. Moreover, the bound exciton luminescence serves as an internal monitor of the free ortho- and free para-exciton densities, whereas the free para-exciton luminescence is allowed only via weak Gamma(-)(25) phonon emission. At high excitation levels, the bound exciton luminescence shows a density-dependent loss of excitons that is well explained by a recently proposed biexciton formation model. The temperature dependence of the bound ortho- and bound para-exciton luminescence indicates a T-1-dependence for the exciton-impurity capture rate.

引用

页数：7

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